Common for the wire harness on the switch to go bad. Inspect the wire harness where it clips on to the switch and look for any signs of damage.
The plastic heats up from the current running through the switch and causes it to melt and then you loose connection caused from melted plastic between the contacts from the harness to the switch.
There is a upgrade to the headlight harness which is larger then the ones that came with the Suburban to address this issues. You can get them at the dealer or NAPA i believe.
Good luck and keep us posted. Thank you for using fixya and stay safe.
Molson02536
Testimonial: "I replaced the turn signal switch which solved the problem. It was that. The headlight wires had melted at the connector. The pain is the new turn signal switch has a malfunctioning wiper component causing the wiper delay to turn on with out being on. Now I have to do it all over. "
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